Patents by Inventor Li Yushan

Li Yushan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • High voltage level shifter via capacitors
    Patent number: 6646469
    Abstract: A driver circuit is disclosed for driving a half bridge driver or similar circuit. The driving circuit induced transient currents in two passive devices, and utilizes the transient currents to set or reset a latch at appropriate times required to properly drive a half bridge driver or similar type of circuit.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: November 11, 2003
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Li Yushan
  • High voltage level shifter via capacitors
    Publication number: 20030107425
    Abstract: A driver circuit is disclosed for driving a half bridge driver or similar circuit. The driving circuit induced transient currents in two passive devices, and utilizes the transient currents to set or reset a latch at appropriate times required to properly drive a half bridge driver or similar type of circuit.
    Type: Application
    Filed: December 11, 2001
    Publication date: June 12, 2003
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventor: Li Yushan
  • Low cost half bridge driver integrated circuit with capability of using high threshold voltage DMOS
    Patent number: 6353345
    Abstract: A low cost half bridge driver IC fabricated in the process technology with a minimum or reduced number of masking steps to implement all the blocks and without the use of the low threshold voltage CMOS. The half bridge driver IC uses a universal 12 Volt supply for all of the blocks with reference to the ground or to the half bridge output. Furthermore, the low differential current from high voltage level shifter transistors of the half bridge driver IC can provide enough voltage swing to set or reset the latch when high threshold voltage DMOS transistors are used in the pulse filter.
    Type: Grant
    Filed: April 4, 2000
    Date of Patent: March 5, 2002
    Assignee: Philips Electronics North America Corporation
    Inventors: Li Yushan, Stephen L. Wong